Simple conduction test device developed based on single-chip microcomputer

Abstract

The utility model discloses a simple conduction testing device based on single-chip microcomputer development, which comprises a case, a single-chip microcomputer is arranged in a case body of the case, the case is provided with a testing board and a to-be-tested PCB (printed circuit board) limiting and fixing mechanism, and the single-chip microcomputer is connected with the testing board; the test board is fixedly installed on the case, the test board is provided with spring probes in contact with PINs of a PCB to be tested, the spring probes are connected with the single-chip microcomputer, and the single-chip microcomputer is connected with the LED lamp. When the PCB detection device is used, the PCB to be detected is placed on the case, the PINs of the PCB to be detected are in one-to-one contact with the spring probes on the test board through the limiting and fixing mechanism of the PCB to be detected, whether the PCB to be detected is qualified or not is judged according to the on-off condition of the LED lamp, and detection is completed. The device is convenient to operate, reliable in function, simple in structure, low in cost and high in practicability, defective PCBs can be effectively prevented from entering the production link, and cost waste is reduced.

Description

Technical Field

[0001] The utility model relates to the technical field of PCB board testing, in particular to a simple conduction testing device developed based on a single-chip microcomputer. Background Technique

[0002] At present, in the production and manufacturing process of PCBs, some PCB boards may have the phenomenon of short circuit between two adjacent wirings due to too thin wiring width and too small spacing. In addition, some PCB boards may have short circuit or open circuit due to the solder paste adhesion between adjacent pads during the welding of PIN feet. The short circuit between two adjacent wirings, short circuit or open circuit will cause the PCB board to fail to work properly, and even cause the components to be burned out when powered on. And this situation cannot be separated by appearance defect detection. For some customized circuit boards, the supplier does not have special equipment for effective detection. Therefore, it is necessary to design a conduction testing device to meet the testing requirements.

[0003] The utility model with the application number 202223260499.9 discloses a PCB board function testing device, including a base box body, which is internally provided with a main controller, and its upper end surface is provided with a testing workbench. There are several thimble avoidance holes on the testing workbench. A testing bracket is arranged on one side of the testing workbench. A PCB board fixing mechanism is arranged on the testing bracket. The PCB board fixing mechanism is located directly above the testing workbench. A digital display screen is also arranged on the testing bracket. Both the testing workbench and the digital display screen are electrically connected to the main controller; the above-mentioned utility model fixes the PCB board through the PCB board fixing mechanism, so that the testing probe is connected to the pads or testing points on the PCB board through the probe avoidance hole, and judges the connection situation of the PCB board according to the testing parameters on the digital display screen and the flashing situation of the indicator lights to complete the testing work of the PCB board. However, the above-mentioned utility model is a common electrical control method, which is not flexible enough, and the testing parameters or testing channels cannot be changed by modifying the program. Content of the Utility Model

[0004] The utility model provides a simple conduction testing device developed based on a single-chip microcomputer to solve the technical problem that it is difficult to detect defects in PCB boards during the current PCB production process.

[0005] In order to achieve the above purpose, the technical solution of the utility model is realized as follows:

[0006] A simple conduction testing device developed based on a single-chip microcomputer, including a chassis, a single-chip microcomputer is arranged inside the chassis box body, a testing board and a limiting and fixing mechanism for the PCB board to be tested are arranged on the chassis, and the single-chip microcomputer is connected to the testing board.

[0007] Preferably, the test board is fixedly mounted on the chassis, and a spring probe is provided on the test board for contacting the PIN pin of the PCB board to be tested, the spring probe is connected to the single-chip microcomputer, and the single-chip microcomputer is connected to the LED lamp.

[0008] Preferably, the chassis is provided with a three-color lamp and a counter, and both the three-color lamp and the counter are connected to the single-chip microcomputer.

[0009] Preferably, the limit fixing mechanism of the PCB board to be tested includes a pressure plate base, a pressure plate and a pin, the pressure plate is hinged on the pressure plate base, the pressure plate base is fixed on the chassis, the pin is fixed on the test board, and the pin is below the pressure plate.

[0010] The pressure plate base and the pressure plate are both located above the test plate where the spring probe end is located.

[0011] Preferably, the pressing plate is Y-shaped, and a spring is provided between the end of the vertical portion of the pressing plate and the pressing plate base.

[0012] Preferably, the chassis is also provided with a stop button and a start button, and the stop button and the start button are both connected to the single-chip microcomputer.

[0013] Preferably, there are N spring probes and N-1 LED lamps.

[0014] Preferably, the counter is a digital counter.

[0015] Preferably, the single chip microcomputer adopts 80C51 series.

[0016] Beneficial effects of the utility model:

[0017] 1. The utility model uses a single-chip microcomputer to calculate data, store data, control the scanning and power supply of each channel loop, and record the results. The output signal controls the LED of the channel to turn on and off to display the test results. The functionality of the single-chip microcomputer can ensure the accuracy of test data calculation and the reliability of circuits and signals.

[0018] 2. The utility model positions the PCB board to be tested by means of a pin. When the PIN pin of the PCB board to be tested contacts the spring probe of the test board, the spring probe has sensitive elasticity and can make up for the small length difference of each pin, thereby ensuring that the PIN pin of the PCB board to be tested and the spring probe can be well connected. When the spring at the tail is in the extended and retracted state, the pressure plate can conveniently press and release the PCB board to ensure reliable contact on the PCB board circuit. The device can be quickly started and stopped by the start and stop button, which is easy to operate. The test results are indicated by the on and off of the LED light, and the test results are easy to read. The operating status is indicated by the three-color light, and the number of tested PCB boards is counted by the counter, which is simple and clear and easy to use.

[0019] 3. The single-chip microcomputer adopted by the present utility model is of the 80C51 series, which belongs to a conventional module, and the other components are also common components. Therefore, the cost of the whole set of devices is relatively low.

[0020] In summary, the present utility model can not only detect short-circuited or open-circuited PCB boards, has the conduction test function for PCB short circuits and open circuits, but also can determine which channel has abnormal conduction, so as to screen out defective products such as short circuits, open circuits, and false soldering of PCB boards. Moreover, it is convenient to operate, has reliable functions, a simple structure, and a low cost, has strong practicability, can effectively prevent defective PCB boards from flowing into the production link, and reduces cost waste. BRIEF DESCRIPTION OF THE DRAWINGS

[0021] In order to more clearly illustrate the technical solutions in the embodiments of the present utility model or the prior art, the following will briefly introduce the drawings required for use in the description of the embodiments or the prior art. Obviously, the drawings in the following description are only some embodiments of the present utility model. For those of ordinary skill in the art, other drawings can be obtained based on these drawings without creative efforts.

[0022] Figure 1 It is the overall appearance diagram of the simple conduction test device developed based on the single-chip microcomputer of the present utility model.

[0023] Figure 2 It is the explosion diagram of the simple conduction test device developed based on the single-chip microcomputer of the present utility model.

[0024] Figure 3 It is the example diagram of the defective PCB board of the present utility model.

[0025] In the figure, 1 - chassis, 2 - stop button, 3 - start button, 4 - LED lamp, 5 - spring probe, 6 - PCB board to be tested, 7 - three-color lamp, 8 - pressure plate, 9 - spring, 10 - pin, 11 - test board, 12 - wiring harness, 13 - counter, 14 - single-chip microcomputer, 15 - terminal block. DETAILED DESCRIPTION OF THE EMBODIMENTS

[0026] The following will clearly and completely describe the technical solutions in the embodiments of the present utility model with reference to the drawings in the embodiments of the present utility model. Obviously, the described embodiments are only some embodiments of the present utility model, rather than all embodiments. Based on the embodiments of the present utility model, all other embodiments obtained by those of ordinary skill in the art without creative efforts belong to the scope of protection of the present utility model.

[0027] Such as Figure 1 and Figure 2As shown in the figure, a simple conduction test device based on single-chip microcomputer development includes a chassis 1. Inside the chassis 1, there is a single-chip microcomputer 14. On the chassis 1, there is a test board 11 and a limiting and fixing mechanism for the PCB board to be tested. The test board 11 is connected to the single-chip microcomputer 14 through a cable 12.

[0028] The test board 11 is fixedly installed on the chassis 1 with screws. A circuit is formed between any two spring probes according to the pin definition of the PCB designer, which is a test output state. There are N spring probes 5, N - 1 LED lights 4 and a test board electrical connection port on the test board 11. The spring probes 5 are in contact with the PIN feet of the PCB board 6 to be tested. The spring probes are only used to connect the current of the PCB board to be tested. The LED lights are installed on the test board. The LED lights 4 are connected to the single-chip microcomputer 14 through the test board electrical connection port. The signal and power supply are controlled by the single-chip microcomputer. The LED lights 4 are used to display the test results. Each LED light 4 represents a different test channel. Whether each channel is abnormal is shown by the on and off of the LED light 4. On indicates that the channel corresponding to the LED light 4 is normal, and off indicates that the channel corresponding to the LED light 4 is abnormal. The test board electrical connection port is connected to the electrical interface of the single-chip microcomputer 14. The test board electrical connection port is used for power supply connection and signal transmission between the single-chip microcomputer 14 and the test board 11.

[0029] The single-chip microcomputer 14 supplies power to the test board 11 and controls its signal. The single-chip microcomputer 14 is used to scan each channel, perform arithmetic storage, and control the signal of the LED lights 4 on the test board 11. The single-chip microcomputer 14 transmits signals to the test board 11 through the cable 12.

[0030] Specifically, the single-chip microcomputer 14 scans and supplies power to each channel circuit between the PIN feet of the PCB board 6 to be tested and the spring probes 5, that is, detects the current or voltage difference, records the scanning results, and compares the scanning results with the design schematic diagram of the PCB board 6 to be tested. If the on and off of the test channel is consistent with the design channel, the corresponding channel LED light 4 is driven to light up as an indication mark, as Figure 3 shown. If the on and off of the test channel is inconsistent with the design channel, the corresponding channel LED light 4 is not driven to light up as an indication mark.

[0031] There is a three-color light 7 and a counter 13 on the chassis 1. The single-chip microcomputer 14 is respectively connected to the three-color light 7 and the counter 13 through a terminal block 15 to control the test process to display the working state and start / stop / reset, and drive the counter. The three-color light 7 is used to indicate three states: running, stopping, and alarming. Green indicates the running state, yellow indicates the stopping state, and red indicates the alarming state. The counter 13 is used to record the number of PCB boards tested. The counter 13 is a digital display counter. Each time the single-chip microcomputer 14 completes the power supply connection scanning of the PCB board 6 to be tested and resets to stop, the digital display counter counts once, which is convenient for the tester to count.

[0032] The limiting and fixing mechanism for the PCB board to be tested includes a pressing plate base, a pressing plate 8 and a pin 10. The pressing plate 8 is hinged to the pressing plate base, the pressing plate base is fixed on the chassis 1, and the pin 10 is fixed on the test board. When the PCB board 6 to be tested is not placed, the pin 10 is below the pressing plate 8. Through the limiting and fixing mechanism for the PCB board to be tested, the PCB board 6 to be tested can be conveniently placed and taken out.

[0033] Both the pressing plate base and the pressing plate are above the spring probe end on the test board to prevent the pressing plate from blocking the LED lamp.

[0034] The pressing plate 8 is Y-shaped. There is a spring 9 between the end of the vertical part of the pressing plate 8 and the pressing plate base. The fitting space formed by the two bifurcated ends extending from the vertical part of the pressing plate 8 matches the size of the PCB board 6 to be tested, so that the two bifurcated ends extending from the vertical part of the pressing plate 8 can press on both ends of the PCB board 6 to be tested, preventing the PCB board 6 to be tested from shaking or displacing.

[0035] The chassis 1 is also provided with a stop button 2 and a start button 3. Both the stop button 2 and the start button 3 are connected to the wiring terminal 15 of the single-chip microcomputer 14 through wires, so as to realize the start-stop and reset control of the test process.

[0036] The single-chip microcomputer 14 adopts the 80C51 series, which is a conventional module to reduce the cost of the whole set of devices.

[0037] The usage method of the present utility model is as follows:

[0038] A. Press the vertical part of the pressing plate 8, place the PCB board 6 to be tested on the test board 11, limit it through the pin 10, and then release the vertical part of the pressing plate 8. Under the action of the spring 9, the two bifurcated ends extending from the vertical part of the pressing plate 8 press on both ends of the PCB board 6 to be tested, so that the PIN feet of the PCB board 6 to be tested are in one-to-one contact with the spring probes 5 on the test board 11;

[0039] B. Press the start button 3. At this time, the three-color lamp 7 shows a green light, indicating that the device is in the working and running state;

[0040] C. When the three-color lamp 7 shows yellow, read the detection result according to the on-off of the LED lamp 4. On indicates that the channel corresponding to the LED lamp 4 is normal, and off indicates that the channel corresponding to the LED lamp 4 is abnormal;

[0041] D. Record whether the PCB board 6 to be tested is qualified or not, mark the abnormal channel, and complete the detection of this PCB board 6 to be tested;

[0042] E. Press the vertical part of the pressing plate 8, take off the PCB board 6 to be tested and classify and sort it according to whether it is qualified or not;

[0043] F. Repeat steps A to E until the detection of all PCB boards to be tested is completed.

[0044] The utility model not only has the conduction test function for PCB short circuit and open circuit, but also can judge which channel has abnormal conduction. Moreover, it is convenient to operate, simple in structure, low in cost and has strong practicability.

[0045] The above are only the preferred embodiments of the utility model, and are not intended to limit the utility model. Any modifications, equivalent replacements, improvements, etc. made within the spirit and principle of the utility model shall be included in the protection scope of the utility model.

Claims

1. A simple continuity test device developed based on a single chip microcomputer, comprising a chassis (1), characterized in that: A single-chip microcomputer (14) is arranged inside the chassis (1), a test board (11) and a limit fixing mechanism for a PCB to be tested are arranged on the chassis (1), and the single-chip microcomputer (14) is connected to the test board (11); The test board (11) is fixedly mounted on the chassis (1); a spring probe (5) is provided on the test board (11) for contacting a PIN pin of a PCB board (6) to be tested; the spring probe (5) is connected to a single-chip microcomputer (14); and the single-chip microcomputer (14) is connected to an LED lamp (4).

2. The simple conduction test device based on single chip microcomputer development according to claim 1 is characterized in that: The chassis (1) is provided with a three-color lamp (7) and a counter (13), and the three-color lamp (7) and the counter (13) are both connected to a single-chip computer (14).

3. The simple conduction test device based on single chip microcomputer development according to claim 2 is characterized in that: The limit fixing mechanism for the PCB board to be tested comprises a pressure plate base, a pressure plate (8) and a pin (10); the pressure plate (8) is hinged on the pressure plate base, the pressure plate base is fixed on the chassis (1), the pin (10) is fixed on the test board (11), and the pin (10) is below the pressure plate (8).

4. The simple conduction test device based on single chip microcomputer development according to claim 3 is characterized in that: The pressure plate base and the pressure plate (8) are both located above the end of the spring probe (5) provided on the test plate (11).

5. The simple conduction test device based on single chip microcomputer development according to claim 4 is characterized in that: The pressing plate (8) is Y-shaped, and a spring (9) is provided between the end of the vertical portion of the pressing plate (8) and the pressing plate base.

6. The simple conduction test device based on single chip microcomputer development according to claim 5 is characterized in that: The chassis (1) is also provided with a stop button (2) and a start button (3), and the stop button (2) and the start button (3) are both connected to the single-chip computer (14).

7. The simple conduction test device based on single chip microcomputer development according to claim 6 is characterized in that: The number of the spring probes (5) is N, and the number of the LED lamps (4) is N-1.

8. The simple conduction test device based on single chip microcomputer development according to claim 7 is characterized in that: The counter (13) is a digital display counter.

9. The simple conduction test device based on single chip microcomputer development according to claim 8 is characterized in that: The single chip microcomputer (14) adopts the 80C51 series.

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